Amazing that I haven't been able to find anything Googling this... seems like a common operation...
What is the recommended procedure for upgrading PHP 5 on a Windows (Server 2003 / IIS 6) box?
I imagine simply: stopping IIS services, moving/renaming the current /PHP directory, creating a new one with the latest version of PHP, and restarting IIS -- this should do the trick.
But I'm a stickler for best practices, and avoiding any unintentional pitfalls.
Going from PHP 5.1.2 to 5.2.6.